BSc in Mathematics at the Aristotle University of Thessaloniki (AUTh), 1987,
MSc at the Department of Informatics, University of Oslo, 1991,
PhD at the Department of Informatics, University of Oslo, 1997.

Dpl. in Mathematics, NUA, Athens, 1973,
M.Sc. in Computer Science, University of London (University College London), UK, 1975,
Ph .D. in Computer Science, University of London (University College London), UK, 1979

Dipl. in Computer Engineering and Informatics, University of Patras, 2002, MBA, National Technical University of Athens and Athens University of Economics & Business, 2003, MSc in Operational Research, London School of Economics (LSE), 2004, PhD in Operational Research, London School of Economics (LSE), 2009